[Elecraft] K3s Odd sound vibrations Edit - Hypothesis, Steps, Conclusion, and Request.

[Clay Autery]

Well, as it turns out, MOST of the engineering improvements in products
come from the field by way of OCD folks like us.
You should feel good that you contributed to the process.

I am sure someone in the loop is monitoring this thread and making notes
for possible documentation/design changes.

As it turns out, YOUR buzzing had/has multiple components sourced from
multiple causes.

Adding chassis stiffener vibration isolation to the list... although
that would be an issue requiring just the right combination of stiffener
and top cover bowing in the correct directions to create and
interstitial interface such that certain frequencies setup a
sympathetic/harmonic vibration.

Reminds me of the days I used Sorbothane to mount HDDs, fans, et al. in
tower chassis to reduce vibrations and other noise.  No one was doing it
then... lots of folks do it now.

______________________
Clay Autery, KG5LKV
(318) 518-1389

On 2/17/2016 3:49 PM, Jerry Moore wrote:
> I had someone contact me off list to suggest putting some small bits of tape
> where the cover touches the center stiffener. I did that and now have zero
> buzzing except around 440HZ or when monitor is turned up nearly all the way.
>
>
> I'm not sure why this isn't an advertised fix. Tape/silicon the ferrite
> beads on both boards and install x5 30mm strips of black tape in specific
> places.
> Easy fix. 
> I've heard it said that nobody remembers what you said, only how you made
> them feel. Right now I'm not feeling too warm and fuzzy about my radio manf.
>
> Thanks to all who contacted me off list with suggestions and shared
> frustration for this issue. 
> 73 ..
>
> Jerry Moore
> CDXA, INDEXA, SKCC, Fists
> AE4PB, K3S - S.N. 010324
> http://www.qrz.com/db/AE4PB
> An Amateur is - Considerate, Loyal, Progressive, Friendly, Balanced, and
> Patriotic.
>
>
> -----Original Message-----
> From: Clay Autery [mailto:cautery at montac.com] 
> Sent: Wednesday, February 17, 2016 3:09 PM
> To: Jerry Moore; elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3s Odd sound vibrations Edit - Hypothesis, Steps,
> Conclusion, and Request.
>
> No, I have not done this mod.  But I have just added it to the list, because
> I AM using the internal speaker.  External speakers are on the list, but
> some way down, so I will be using the internal speaker (or actually phones)
> for some time.
>
> In all fairness, I would think this issue is only rarely an "issue" for the
> VAST majority of ops...  Between external speakers, not having the PA to
> begin with, or using headset/phones, most folks probably don't use the
> internal speaker at audio levels sufficient to reproduce the issue.
>
> I would prefer to do the fix myself than to have the additional labor
> involved in fixing the beads/conductors down (and the accompanying increase
> in price/avail of PA modules).
>
> I examined my K3s closely as I assembled it... I consider it a supremely
> well-engineered piece of equipment and worth every penny I paid.  :-)
>
> Have a super day!
>
> ______________________
> Clay Autery, KG5LKV
> (318) 518-1389
>
> On 2/17/2016 1:57 PM, Jerry Moore wrote:
>> Have you done this ? 
>>